如何用C#在UWP应用中播放flv？

<MediaElement x:Name="mediaElement" />

using FFmpegInterop;

...

private async void PlayFLV(string filePath)
{
    var file = await Windows.Storage.StorageFile.GetFileFromPathAsync(filePath);
    var stream = await file.OpenAsync(Windows.Storage.FileAccessMode.Read);

    var ffmpegMSS = FFmpegInteropMSS.CreateFFmpegInteropMSSFromStream(stream);
    var mediaStreamSource = ffmpegMSS.GetMediaStreamSource();

    mediaElement.SetMediaStreamSource(mediaStreamSource);
    mediaElement.Play();
}